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Zaltin

Auto ISO settings behaving weird

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Zaltin   

Hello everyone. 

Just came back from a trip, and going thru my images taken with the X100F I was very surprised by some of the Auto ISO values it had chosen! I almost always have ISO set to Auto, with a default sensitivity of 200 (natch) and a max of 12800, for night shooting. 

HOWEVER - the camera has repeatedly chosen the highest ISO setting possible, 12800, in broad daylight. Yes, indoors, but in windows with sunlight, and brightly-lit rooms with natural light. This is very confusing to me as there is absolutely no need for the camera to chose more than, say max 800 ISO in these situations. 

Well, I'm going to set it to "AUTO 2" more often, same default, but 6800 Max. 

Just curious what you make of this conundrum?

Cheers, O. 

ps. Attached image is just by a window in sunlight - the camera chose ISO 12800! :)

DSCF5819.jpg

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dem   

The EXIF says: Aperture priority, f/2.0, shutter speed 1/120 s, ISO 12800.

Is your minimum shutter speed set to 1/120 s? Check the ND filter is not on. 

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Also, what is your dynamic range set to? Judging by the shadows under the menu and on her face, that doesn't look like 100% to me. If you have it set to Auto or 400% that could be costing you a couple of stops worth of ISO. 

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K1W1_Mk2   

and understand that the camera will ALWAYS push the iso up first to preserve shutter speed.

Setting a default high iso to 12800 is somewhat crazy you would be far better to set the default to something like 3200 and the manually push it up if and when you need to. The only time you would want an iso that high by default is if you shoot exclusively in low light.

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Zaltin   

Thanks guys! This has been very instructive for me. What do you recommend the best DR setting to be? 100%

 

Cheers, o. 

3 hours ago, K1W1_Mk2 said:

and understand that the camera will ALWAYS push the iso up first to preserve shutter speed.

Setting a default high iso to 12800 is somewhat crazy you would be far better to set the default to something like 3200 and the manually push it up if and when you need to. The only time you would want an iso that high by default is if you shoot exclusively in low light.

 

Yeah, sorry maybe I said it wrong. Default was at 200. MAX was at 12800 ISO. (Have changed this down to 6400). 

o. 

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1 hour ago, Zaltin said:

Thanks guys! This has been very instructive for me. What do you recommend the best DR setting to be? 100%

I leave my most used custom settings at DR100% specifically to avoid the situation you encountered, and will switch it when needed. Obviously indoors you may want to change it to have more shadow detail, but that can incur a tradeoff of high ISOs as in your shot. Outdoors, you may want to up the DR to capture more architectural details without blowing out the sky for example, and in that case the ISO may not matter much as it will likely still be pretty low. I still just leave my defaults at 100 though.

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